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Convert JSON to JSON Lines

Paste your JSON and this tool converts it to JSON Lines instantly, right in your browser. JSON (JavaScript Object Notation) is the lingua franca of web APIs: compact, strictly typed, and supported everywhere. JSON Lines (NDJSON) puts one JSON value on each line, which is how logs, streams and data exports are usually written.

The conversion is completely client-side: there's no upload, no queue, and no account. Big files are converted in the background with a Cancel button, the options for the lossy steps are one click away, and your last conversion is remembered.

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JSON to JSON Lines Converter — frequently asked questions

How do I convert JSON to JSON Lines?
Paste your JSON, or open or drop a file, and the JSON Lines appears instantly. Copy it, download it (named after your file), or open it in another tool. Errors point to the line and column. Everything happens in your browser.
How does JSON Lines map to JSON?
Each non-empty line is one JSON value, and together they make a JSON list; a list written as JSON Lines puts each item on its own line. A line that isn't valid JSON is reported by its line number.
Is my data uploaded to a server?
No. The conversion runs entirely in your browser — your data never leaves your device, so it's safe to convert configuration, API payloads, and other sensitive files. You can even go offline once the page has loaded.
Is this converter really free?
Yes. No sign-up, no payment details, no file-size paywall, and no watermark on the output.

All format converters

JSONYAMLJSONXMLJSONCSVYAMLJSONYAMLXMLYAMLCSVXMLJSONXMLYAMLXMLCSVCSVJSONCSVYAMLCSVXMLJSON LinesJSONJSON LinesCSVCSVJSON LinesJSONTSVTSVJSONCSVTSVTSVCSVJSONTOMLTOMLJSONYAMLTOMLTOMLYAML

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